Note 1 - Basis of Presentation (Tables)
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9 Months Ended |
Sep. 30, 2019 |
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| Notes Tables |
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| Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] |
| | | | | | | | | | | | | | | | | Derivative assets (1) | | $ | 23,150 | | | $ | 60,687 | | | Unamortized bond/insurance premiums | | | 5,497 | | | | 5,197 | | | Prepaid deposits related to royalties | | | 8,794 | | | | 8,872 | | | Other | | | 2,780 | | | | 1,650 | | | Prepaid expenses and other assets | | $ | 40,221 | | | $ | 76,406 | | |
| Property, Plant and Equipment [Table Text Block] |
| | | | | | | | | | | | | | | | | Oil and natural gas properties and equipment | | $ | 8,471,973 | | | $ | 8,169,871 | | | Furniture, fixtures and other | | | 20,247 | | | | 20,228 | | | Total property and equipment | | | 8,492,220 | | | | 8,190,099 | | | Less accumulated depreciation, depletion and amortization | | | 7,771,269 | | | | 7,674,678 | | | Oil and natural gas properties and other, net | | $ | 720,951 | | | $ | 515,421 | | |
| Schedule of Other Assets, Noncurrent [Table Text Block] |
| | | | | | | | | | | | | | | | | Appeal bond deposits | | $ | 6,925 | | | $ | 6,925 | | | Unamortized debt issuance costs | | | 4,138 | | | | 4,773 | | | Investment in White Cap, LLC | | | 2,885 | | | | 2,586 | | | Unamortized brokerage fee for Monza | | | 4,131 | | | | 2,277 | | | Proportional consolidation of Monza's other assets (Note 4) | | | 3,660 | | | | 3,275 | | | Right-of Use (Note 8) | | | 10,239 | | | | — | | | Escrow deposit - Apache lawsuit (Note 12) | | | — | | | | 49,500 | | | Derivative assets | | | — | | | | 21,275 | | | Other | | | 886 | | | | 936 | | | Total other assets (long-term) | | $ | 32,864 | | | $ | 91,547 | | |
| Schedule of Accrued Liabilities [Table Text Block] |
| | | | | | | | | | | | | | | | | Accrued interest | | $ | 25,414 | | | $ | 12,385 | | | Accrued salaries/payroll taxes/benefits | | | 2,267 | | | | 2,320 | | | Incentive compensation plans | | | 3,667 | | | | 10,817 | | | Litigation accruals | | | 3,673 | | | | 3,673 | | | Lease liability (Note 8) | | | 1,877 | | | | — | | | Other | | | 356 | | | | 416 | | | Total accrued liabilities | | $ | 37,254 | | | $ | 29,611 | | |
| Other Noncurrent Liabilities [Table Text Block] |
| | | | | | | | | | | | | | | | | Dispute related to royalty deductions | | $ | 4,687 | | | $ | 4,687 | | | Dispute related to royalty-in-kind | | | 2,231 | | | | 2,135 | | | Apache lawsuit (Note 12) | | | — | | | | 49,500 | | | Uncertain tax positions including interest/penalties | | | — | | | | 11,523 | | | Lease liability (Note 8) | | | 7,883 | | | | — | | | Other | | | 1,466 | | | | 845 | | | Total other liabilities (long-term) | | $ | 16,267 | | | $ | 68,690 | | |